Stock-Based Compensation (Summary of Restricted Share Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Restricted Shares
Number of Shares
Outstanding - beginning of year, number of shares	385,168
Granted, number of shares	212,050
Vested, number of shares	(170,320)
Canceled or expired, number of shares	(4,000)
Outstanding - end of year, number of shares	422,898
Weighted Average Grant Date Fair Value
Outstanding - beginning of year, weighted average grant date fair value	$ 14.94
Granted, weighted average grant date fair value	$ 30.37
Vested, weighted average grant date fair value	$ 18.86
Canceled or expired, weighted average grant date fair value	$ 21.59
Outstanding - end of year, weighted average grant date fair value	$ 21.04
Performance Shares
Number of Shares
Outstanding - beginning of year, number of shares	56,000
Granted, number of shares	0
Vested, number of shares	(14,000)
Canceled or expired, number of shares	0
Outstanding - end of year, number of shares	42,000
Weighted Average Grant Date Fair Value
Outstanding - beginning of year, weighted average grant date fair value	$ 20.30
Vested, weighted average grant date fair value	$ 20.30
Outstanding - end of year, weighted average grant date fair value	$ 20.30